Automatic stoker



Nov. 28, 1933.

F. CH'AMBERLIN AUTOMATIC STOKER Filed April 21, 1932 flor/nego.

Patented Nov. 28, 1933 PATENT OFFICE- AUTOMATIC STOKER ForestChamberlin, Painesville, Ohio Application April 21, 1932. Serial No.606,745

1 Claim.

This invention relates to an automatic stdker designed primarily for usein connection with furnaces forming va part of heating plants ofdwellings, small shops or the like.

An important object of the invention is the provision of a stokerincluding a reciprocating feeder onto which the coal is deposited andcarried forwardly, a small portion of the fuel, or

that fuel at the forward end of the stolrer,`

being pushed into the fire box of the furnace, thereby reducing thepower necessary for the operation of the feeder to a minimum, andeliminating the objectionable stoker which requires a maximum power,when feeders of the pusher type are employed in pushing the entirecontents of the feeder tube of the stoker, in feeding the coal to thefurnace.

A further object of the invention is to provide a feeder of a novelconstruction which will insure against the coal clogging in the feedertube, of the apparatus as the feeder reciprocates in operation.

A still further object of the invention is to provide a stoker whichwill be thermostatically controlled, thereby insuring an eventemperature within the building heated by the furnace equipped with astroker constructed in accordance with the invention.

Withthe foregoing and other objects in view, which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed, may be made within thescope of what is claimed, without departing from the spirit of theinvention.

Referring to the drawing:

Figure 1 is a longitudinal sectional view through a stoker constructedin accordance with the invention.

Figure 2 is a horizontal sectional view through the stoker.

Figure 3 is a sectional view taken online 3-3 of Figure 1.

Figure 4 is a sectional detail view illustrating the construction of theagitator used in the discharge pipe of the hopper,

Throughout the specification, the term forward is used meaning thedirection in which the fuel is fed.

Referring to the drawing in detail, the Stoker comprises a housing orbody portion 5, which embodies preferably an upper section 6 and a lowersection 7, the sections being connected by means of the bolts 8.

Due to this construction, it will be seen that the body portion may bereadily and easily opened permitting of ready access to the gearingsupported within the housing 5.

Legs 9 are provided on the housing 5, to which legs wheels 10 areconnected, so that the device may be readily moved in position at thefront of the furnace.

The forward end of the housing 5 is formed with a threaded opening intowhich one end of the feeder tube 11 extends, the feeder tube being of alength to extend an appreciable distance within the furnace, the freeend thereof lying directly over the coals of the fire bed.

Supported above the feeder tube is a hopper 12, which is, incommunication with the feeder tube 11, through the discharge pipe 13that is shown as extending into the feeder tube, through an openingformed in the wall of the feeder tube.

The wall of the discharge pipe 13 is formed with a slot, through whichthe pins 14 of the agitating bar 15 extend, the agitating bar 15 beingslidably mounted in a guide 16 located directly'under the slot.

Extending from the .bar 15, is an ear 17, which ear is supplied with atransversely disposed pin 18 that is engaged by the forked end of thearm 19 which is pivotally mounted on the bearing 2O that is in turnsupported on the partition 21, located in spaced relation with theforward end of the housing 5.

The space between the partition 21 and forward end of the housing 5,provides a blower chamber 22, the chamber 22 being in communication withthe atmosphere, through the opening 23 formed in the upper wall of thehousing.

A shaft 24 extends through the blower chamber, and provides the supportfor the blowers 25, which are shown as spaced apart. The space betweenthe blowers is provided so that d ust or other foreign matterthat may bedrawn into the blower chamber, from the feeder tube 11, may be forcedfrom the blower chamber, by the blowers 25.

Pipes 26 extend from the blower housings, l'

by the jacket 29. which is shown as positioned around the feeder tube.Due to this construction, a portion of the blast of air may be shuntedinto the space 28' to maintain the feeder tube in a cool condition atall times.

The outer end of the jacket 29 is formed with an inwardly .extendedannular ange that contacts with the feedertube closing the end of thespace 28. Openings 10 are formed in the flange, to allow air to passfrom the space 28.

The reference character 30 designates a crank shaft which is mountedwithin the housing and operated by means of the gear 31 which is mountednear one end of the crank shaft. Power is transmitted to the gear 31,byk the shaft 32, through the pinion 33 mounted on the shaft 32. Securednear one end of the shaft 32 is `a gear 34 that meshes with the pinion35 secured to the shaft 36. V

This shaft 36 is of a `length to extend beyond the side wall of thehousing 5, where it is supplied with pulleys 37 and 38 respectively. v

The power shaft which is indicatedby-the ref erence character 39 may beoperated by any suitable source of power, however it is contemplated toemploy an electric motor for supplying the power, so that a thermostatmay be used in controlling theoperation of the power shaft.

A pulley 40 is mounted on the power shaft and transmits movement to thepulley 38, through the medium of the belt 41. The shaft 24 on which theblowers 25 are mouuted, has one of its ends extended beyond the sidewall of the housformed in the partition 21, the inner end of the rod 49being pivotally connected with the link 50,

vthat in turn connects with the crank 51 of the fthe draft through thepipe 28.

ing 5, where it is supplied with a pulley 42, which receives motionfromthe pulley 37, through the belt 43. y

Thus it will be seen that due to this construction the crank shaft 30and blower shaft 24 are operated from the same power shaft so that theywill operate simultaneously.

Secured to the shaft 30, is a cam 44 which operates in an elongatedopening formed in the inner end of the arm 19, with the result that asthe shaft 30 rotates, the arm 19 pivots on the bearingI 20, resulting ina reciprocating movement of the agitating bar to cause the coal vto befed through the discharge pipe without danger of the coal clogging.

The feeder bar, which is indicated by the reference character 45 is ofnovel construction, and plays an important part in the operation of thest'oker, and as shown the feeder bar is formed with a curved lowersurface conforming to the curvature of the feeder tube 11, while theupper surface thereof is fiat and of stepped formation, definingshoulders 46 and 47 respectively.

In order that the feeder bar 45 will be held in a position to insure atrue horizontal movement Secured to the inner end of the feeder bar, isa rod 49 that operates through an opening In order that the variousgears and pinions of the device may be properly lubricated, the lowersection of the housing 5 is so constructed that it provides an oilcasing so that the gears and pinions operate in oil.

A brace bar 53 extends from the upper surface of the housing 5 andconnects with the hopper 12 for providing a support for the hopper.

The operationof the device isasfollows: Coal is deposited in the hopper12, from where the coal feeds by-gravity through the discharge pipe 13,and falls onto the upper surface of the feeder bar, between theshoulders 46 and`47.

As the feeder bar moves rearward, the material passes over the shoulder46 and falls onto the forward end of the feeder bar from where it dropsinto the feeder tube, and is pushed into the furnace, with the nextmovement of the feeder bar.

Due to this construction, the major portion of the weight of thematerial is carried by the feeder bar, to the end that a motor of aminimum horse power may be used in operating the device, and since onlya small quantity of coal is pushed through the feeder tube at eachstroke of the feeder bar, a free operation of the feeder bar is insuredat all times.

It will of course be understood that the blowers operate to create adraft of ,air which circulates around the feeder tubey 11, cooling thefeeder tube.

The blowers also create a draft in the furnace .to insure the burning ofthe coal.

Having thus described the invention what is claimed is:

A stoker comprising a housing, a vertical partition within the housingand spaced from the front wall thereof, providing a blower housing, afuel feeding tube extending from the forward end of the housing andcommunicating with the blower housing, a reciprocating feeding baroperating Within the fuel feeding tube, spaced blowers mounted withinthe blower housing and having open inner ends to permit materialto passinto the blowers from the outer end of the fuel feeding tube, and havingdischarge passages, a passage communicating with said dischargepassages, an air jacket surrounding the fuel feeding tube, spacedtherefrom and provided with discharge openings near the discharge end ofthe feeding tube, and a passage leading from the last named passage tothe air jacket, means for operating the feeding bar, and means forfeeding material to the fuel vfeeding tube.

FOREST CHANIBERLIN.

